Cisco CCNA mock exam questions sample test – Question 31

.You are a network administrator for your organization. Your organization has two Virtual LANs, named Marketing and Production. All Cisco 2950 switches in the network have both
VLANs configured on them. Switches A, C, F, and G have user machines connected for both VLANs, whereas switches B, D, and E have user machines connected for the Production
VLAN only. (Click the Exhibit(s) button to view the network diagram.)
You receive a request to configure Fast Ethernet port 0/2 on Switch B for a user computer in the Marketing VLAN. VLAN numbers for the Marketing and Production VLANs are 15 and
20, respectively.
Which Cisco 2950 switch command should you use to configure the port?

A. SwitchB(config-if)#switchport trunk vlan 15
B. SwitchB(config)#switchport access vlan 15
C. SwitchB(config-if)#switchport access vlan 15
D. SwitchB(config-if)#switchport trunk vlan 15, 20

Correct Answer: C

Explanation:
The SwitchB(config-if)#switchport access vlan 15 command should be used to enable the port for the Marketing VLAN in access link mode. You must first enter the interface
configuration mode by using the following command:
SwitchB(config)#interface fast 0/2
When executing the command switchport access vlan vlan #, if the VLAN number does NOT match that of the correct VLAN, the host connected to this port will not be in the correct
VLAN. If the VLAN number doesn’t exist, the host will not be able to communicate with any resources on the LAN.
User machines are always connected to an access link. A trunk link is used to span multiple VLANs from one switch to another or from a switch to a router. For inter- VLAN routing to
function, the port that is connected to the router must be configured as a trunk port. To configure a port into trunk mode, you should use the following command:
SwitchB(config-if)#switchport mode trunk
The SwitchB(config)#switchport access vlan 15 command is incorrect because the router is in global configuration mode. The switchport command is applied in the interface
configuration mode.
All other options are incorrect because the access parameter should be used with the switchport command. The trunk parameter is used to add allowed VLANs on the trunk. The
correct command syntax is:
switchport trunk {{allowed vlan vlan-list} | {native vlan vlan-id} | {pruning vlan vlan-list}}
Objective:
LAN Switching Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot VLANs (normal/extended range) spanning multiple switches